Active_comparator: HugoTM Ras (Medtronic) robotic system

The patient is positioned supine position and a tilt of Trendelenburg of 12 degrees is given. A Verres needle insufflation at Palmers' point at the left subcostal margin will be done to achieve a pneumoperitoneum of 12 mmHg. Subsequently, a trocar of 12 mm is placed at the upper margin of the umbilicus using an optical trocar. Two further trocars of 8 mm are placed left and right side at 7 to 8 cm distance from the umbilical trocar and 2 cm caudal from the umbilical trocar. The setup of the arms, tilt and angles are done using the setup guide. The operation is performed using a scope with a 0°-degree angle. As instruments we have a fenestrated bipolar forceps in the left hand and a monopolar curved scissors in the right hand. Mesh used will be DextileTM Anatomical Mesh X-Large of 16x12 cm. There is a left sided and a right sided version and in bilateral hernias the meshes will overlap on the midline. The peritoneum is closed using a barbed suture (V-Loc 3/0) of 15 cm in length.

Active_comparator: daVinci Xi (Intuitive Surgical) robotic system

An 8-mm trocar will be placed at the supraumbilical position after creation of pneumoperitoneum using a Verress needle with an intra-abdominal pressure of 12 mmHg. Two additional trocars (8 mm) are placed bilaterally in the flank at the level of the umbilicus under direct vision. The distance between the lateral trocars and the umbilical trocar will be 7 cm at minimum. The Progrip™ Laparoscopic Self-Fixating Mesh of 12×16 cm (anatomic version, Medtronic, Minneapolis, MN, US) will be used. The suture will be a slowly absorbable barbed suture 15 cm in length (V-Loc™ 90, Medtronic, Minneapolis, MN, US). The trocars are docked to the robotic arms, with the endoscope at the umbilicus. Inguinal hernia repair will be performed according to the standard surgical principle.